| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] developed a system | 12 |
|
| 2 | have developed a system | 12 |
|
| 3 | has developed a system | 7 |
|
| 4 | [vb -s] developed a system | 7 |
|
| 5 | developed a [noun sg] system | 5 |
|
| 6 | developed a [noun] system | 5 |
|
| 7 | developed a system [prep] | 7 |
|
| 8 | developed a system [prep] | 7 |
|
